Soldiers place flags at Arlington for Memorial Day(17 images)

Old Guard U.S. Army soldiers place American flags at the tombstones of the fallen at Arlington National Cemetery in Arlington, Va., on Thursday in advance of Memorial Day weekend. President Donald Trump and first lady Melania Trump visited the cemetery as well, to take part in the "Flags In" tradition.

The changing of the guard by the Tomb Guard sentinels of the 3rd U.S. Infantry Regiment takes place at the Tomb of the Unknown Soldier, which is guarded 24 hours a day. Photo by Pat Benic/UPI | License Photo

It takes the soldiers about four hours to place all the flags, which are removed after Memorial Day. Photo by Pat Benic/UPI | License Photo

Soldiers get ready to place the flags. Photo by Pat Benic/UPI | License Photo

The changing of the guard at the Tomb of the Unknown Soldier is a special ceremony that happens every hour. Photo by Pat Benic/UPI | License Photo

The changing of the guard at the Tomb of the Unknown Soldier. Photo by Pat Benic/UPI | License Photo

The changing of the guard at the Tomb of the Unknown Soldier. Photo by Pat Benic/UPI | License Photo

The amphitheater at the Tomb of the Unknown Soldier will host a tribute to veterans on Memorial Day. Photo by Pat Benic/UPI | License Photo

The amphitheater at the Tomb of the Unknown Soldier will host a tribute to veterans on Memorial Day. Photo by Pat Benic/UPI | License Photo

The changing of the guard by the Tomb Guard sentinels of the 3rd U.S. Infantry Regiment takes place at the Tomb of the Unknown Soldiers at Arlington National Cemetery in Arlington, Virginia on Mary 23, 2019. The Tomb is guarded 24 hours a day. More than 250,000 flags were placed on the tombstones of the fallen during Flags-In day prior to Memorial Day. Photo by Pat Benic/UPI | License Photo

President Donald Trump and first lady Melania Trump visit the cemetery during the "Flags-In" ceremony. Photo by Kevin Dietsch/UPI | License Photo